Work chuck



Oct. 24, 1944. 1'. ZIMMERMAN woRK CHUCK Filed Dec. 6, 1943 2 Sheets-Sheet 1 INVENTOR.

v THOMAS ZIMMERMAN ATTORNEYS v2 Sheets-Sheet 2 fr l/ ll T. ZIMMERMAN WORK CHUCK Filed Dec.

lll// AI Oct. 24, 1944.

INVENTOR. THOMAS ZIMMERMAN ATTORNEYS Patented Oct. 24, 1944 Thomas Zimmerman, Grosse Pointe Farms,

Mich., assigner to lKelsey-Hayes Wheel Company, Detroit, Mich., a corporation of Dela- 'ware Application December 6, 1943, seriei'No. 513,083

-10 claims. (o1. 51-.22n

The invention relates to work chucks and re- I fers more particularly to diaphragm chucks for holding tubular work.

The invention has for one object to provide an improved chuck which is constructed to holdy,5l

.tubular work accurately in position.

The invention has for other objects to provide a chuck which maintains a true shape over along period of operation and until wear of the clamping jaws occurs; and to provide'a chuck iniv ":10

4which the clamping jaws are replaceable.

. The invention has for a further object to proj vide a chuck constituting 'a unit comprising an -arbor member, diaphragms and 'means for operating the diaphragms to control thefoperation of the chuck.

u fully hereinafter set forth. e

In the drawingsl Figure l is an end view of a work chuck embodying the invention;

- Figure 2 is a cross A section'on the line 2--25'442 of Figure 1; l

Figures 3, 4 and 5 are cross sections on the `lines 3--3, 4 4, and 5 5, respectively, of Fgure 2;

|| upon the drive pates l2 of the grinding mechine.

The diaphragms 2 and 3 are spaced llongitudinally of the arbor member I and also located longitudinally inwardly fromv its end portions 4 andi5. The diaphragms are integral with and extend radially outwardly from the arbor member and are provided with the resilient discf portions I3, the axially extending arms I4 which extend toward each other and are spaced radially outwardly of the disc portions I3, and the peripherally spaced axially extending bosses I5 near the outer edges of the diaphragms and extending from the diaphragms in directions 'opposite the arms I4. The arms I4 and the bosses I5 are `preferably formed by machined radial slots.

clamping jaws I6 secured toits radially outer face by the screw I'I. The radially' outer faces of the jaws are concentric with the radially 'outer faces of the arms and, furthermore, are preferably formed with the parallel grooves I8 providing teeth for engaging the` radially'inner face of the cylindrical work, which in the present 1 instance is a thin walled cylinder sleeve. It will Figure 6 is a View similar to Figure `2` showing-M30 befused to hold tubular work or various crossirygg,

`sections while'various types of operations are being performed on the work. More particularly, the work chuck is designed to internally hold l cylindrical work, such as a cylinder sleeve, a

bushing, or a bearing, in a grinding I'nachinemri()v while the external Surface of the cylindricalwork vis beinglground.

The work chuck, as illustrated in Figures 1 to 5; inclusive, comprises the arbor member I,

'the diaphragms 2 and 3 on the arbor men"iber,y 45

and actuating means for' exing the diaphragms also mounted on the'arbor member. The arbor member is one-piece and has the end portions 4 and 5 which are formed with the axial countersinks- 6 and l, respectively, for mounting on the 50 centers 8 and 9, respectively, of the grinding mal, chine. The end portions 4 and 5 are also preferably formed to have square cross sections providl ing the pairs of opposite dat faces I0, one pair of` which is adapted to engage the drive blocks 55 422` and the rods' 23.

be noted that the radially outer'faces of the teeth are located radially beyond the peripheries of the diaphragms'so that the latter can not interfere with the mounting or `dernounting of the cylindrical work.

The means for ilexing the diaphragm's 2 and 3 to move the jaws I6 generally radially inwardly to released position'comprises the collars I9 and 2U, the abutment member 2I, the nut The collar I9 is sleeved on the portion ofthe arbor member longitudinally beyond the diaphragm 2 toward the end portion 4. 'I'he collar 20 is sleeved on vthe arbor member longitudinally thereof from the diaphragm 3 toward the end portion 5. The two collars I9- and 20 have the peripheral flanges 24 which are cngageable with the bosses I5 of the diaphragms. The abutment member 2l is slidably vsleeved on the arbor member between the collar 20 and the end portion 5 and is held from rotation relative to the arbor memberby suitable means, such as the key 25. The nut 22 is threaded on the abutment member and abuts the collar 2U. The rods 23 extend longitudinally ofthe arbor member and are preferably equally sp'aced angularly of the arbor member. Each rod has a head 26 extending within a recess in the abutment 2| and providing the shoulder `2'I abutting the inner end The arms I4 have radially outer arcuate -faces with the same radius from the axis of the arbor member and each o'f the arms 'has the cf the recess. Each rod also has the stem 28 which extends through the abutment member 2l and the collar 20, the disc portions of the diaphragms 3 and 2, and further has the externally threaded end portion 29 which is threaded into the collar I9. The construction is such that byv rotating the nut 22 in the proper direction the peripheraliiange 24 Aof the collar 20 is forced against the bosses I5 of the diaphragm 3 and at the same time the abutment 2| is forced.

away from the collar 20 .and operates through the rods 23 upon the collar I9 to force its peripheral iiange 24 against the bosses I5 of the diaphragm 2 with the result that diaphragms 2 and 3 are flexed and their outer peripheral portions are forced toward each other and the arms I4 of these diaphragms and their jaws I5 are move generally radially inwardly` tol released position. On the other hand, by turning the nut 22 in the opposite direction it will be seen that the diaphragms willbe released and their arms and the jaws will be free to move generallyra- 'dially outwardly under the inherent resiliency in the diaphragms so that the jaws will internally grip the cylinder sleeve and exert a predeter-e mined pressure thereon. The construction is suchthat the' pressures exerted by the jaws are equal so that the cylinder sleeve is not distorted from its cylindrical shape, but is held true and gripped sufliciently rmly to be held from rota-ri tion relative to the `arbor member while the external surface is beingground. The mounting and demounting of the cylinder sleeve is accomplished 'while the chuck is removed from the grinding machine. A

In the modification illustrated in Figures 6 and '7, the arbor member 30 of the work chuck, instead of being formed in one'pece, is formed of the arbor end sections 3I and 32 and the arbor intermediate section'33. all being in axial align-"l" ment and the intermediate section being secured to the end sections to drive the one with the other. As shown. the intermediate section is telescoped over the inner parts of the end sections preferably with la tight t sufficient to ro-I tate the Ysections together. vIt will be noted that the end sections are tubular and provided with the plugs 34' xedly'se'cured therein and having the countersinks for receiving the centers of the grindingv machine. It will also, be noted that the end portion 3| is externally shaped, as shown in Figure '7, to provide opposite parallel let faces for driving the arbor member from the grindingr machinedriveplate. In this construction the Adiaphragms 35 and 36 are integral with' and vthe abutment`4I, the nut 42 and `the'rods 43.

so that their inherent resiliency causes the clamping jaws to exert uniform pressure on the inner surface of the cylinder sleeve to accurately position the same while its external surface is be- Ving ground.

What I claim as my invention is: 1. A` work chuck comprising an arbor member provided with mounting means at its ends, diaphragmson said arbor member, an annular series of clamping jaws on each of said diaphragms, and means on lsaid arbor member for flexing said diaphragms to move said jaws.

2. A work chuck comprising an arbor member, diaphragms spaced longitudinally of said arbor member, an annular series of clamping jaws on each of said diaphragms, and means comprising a rotatable member for iiexing said diaphragms to move saidjaws generally radially.

3. A work chuck-comprising an arbor member, diaphragms spaced longitudinally of said arbor member, an annular series of clamping jaws on each of said diaphragms, and means for ilexing said diaphragms to move said jaws generally radially, said flexing means comprising members extending longitudinally of said arbor member and operatively connected to said diaphragms, and a rotatable member for actuating said longitudinally extending members.

4. A work chuck comprising an arbor member, diaphragms spaced longitudinally of said arbor member and extending radially outwardly therefrom, an annular series of clamping jaws on each of said diaphragms axially offset from the radially outer edge thereof, collars on said arbor member engageable with said diaphragms near their ra- 'dially outer edges, and means comprising mem- The collar 39 is sleeved on the arbor end section 3| and engages the diaphragm 35 Vnear its .ra-

- dially outer edge. The collar 40 is sleeved on the abutment and abuts the diaphragm' 36 near its radially outer edge. The abutment 4I is slid- -ably sleeved on the arbor end section 32 and bers extending longitudinally of said arbor member and a rotatable member for moving said co1- lars to ilex said diaphragms.

5. A work chuck comprising an arbor member, diaphragms spaced longitudinally of and extending radially outwardly from said arbor member, an annular series of'clamping jaws on each of said diaphragms offset axially from the radially outer edge thereof, collars on saidarbor member engageable with said diaphragms near the radially outer edges thereof, an abutment member nonrotatably sleeved on. said arbor member, a nut threaded on said abutment member and engageable with one of said collars, and rods having head abutting said abutment member and threaded portions engaging the other of said collars. v

6. A work chuck comprising an arbor member having its ends formed with means for mounting said arbor member with one of its ends formed with driving faces, resilient diaphragms on said arbor member and extending radially outwardly therefrom, clamping jaws on each of said diaphragms, and 'means on said arbor member for 4flexing said diaphragms to move said jaws.

7. A work chuck comprising an arbor member having spaced axially aligned sections and an intermediate connecting section, resilient diaphragms integral with and extending radially outwardly from said first mentioned sections, clamping jaws 0n each of said diaphragms axially offset therefrom near its outer edge, and means on said arbor member comprising collars on said first mentioned sections engageable with said diaphragms near their radially outer edges for flexing said diaphragms.

8. A work chuck comprising an arbor member provided with mounting means at its ends, diaphragms on said arbor member, an annular series of clamping jaws on each of said diaphragms axially oiset therefrom, and means on said arbor member and comprising members engageable with said diaphargms near the radially outer edges thereof for flexing said diaphragms to move said jaws generally radially.

9. A work chuck comprising an arbor member 15 said diaphragm.

provided with mounting means at its ends, a diaphragm on said arbor member and extending THOMAS ZIMMERMrN. 

